code: Cleanup and warning fixes from the Vulkan PR (#6163)

Co-authored-by: emufan4568 <geoster3d@gmail.com>
Co-authored-by: Kyle Kienapfel <Docteh@users.noreply.github.com>

src/citra_qt/debugger/ipc/recorder.cpp

@@ -57,6 +57,7 @@ QString IPCRecorderWidget::GetStatusStr(const IPCDebugger::RequestRecord& record
         return tr("HLE Unimplemented");
     default:
         UNREACHABLE();
+        return QLatin1String{};
     }
 }